prefect.environments.storage.docker._build_image()

creates a temporary directory that it uses for the docker build context. However, later docker reports that it cannot find this directory. Simply changing it to an absolute path resolves this error.

This ends up creating an issue with this is the generated Dockerfile doesn't escape the windows path separators, resulting in a failed COPY command

If the dockerfile argument is not passed in (such as when using the interim docker image method), then

TemporaryDirectory(None)

is called, which results in a full path as shown below